Hammer mill



Aug. 11, 1931.

J. MURSCH HAMMER MILL Filed Nov. 8. 1929 Patented Aug. 11, 1931 UNITED STATES Laaste @PATENT .o1-*FICE JOHN MURSCH, OF KENMORE, NEW YORK, ASSIGNOR TO' BUFFALO HAMMER MILL CORPORATION, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK HAMMER MILL;

Application mea November s, ma seri-ai No. 405,676.

It is well known to those skilled in the art that when handling some materials in hammer mills, particularly when handling relatively large sheets of paper or the like, the material may be thrown back against the rear breaker plate beyond the reach of the hammers as it is fed into the machine and is then drawn down over the perforated bottom of the mill as a result of air currents, or other forces, thus closing off the outlet and making it necessary to stop the mill so that the obstacle can be removed.

It has been an object of my invention to provide means whereby sheet material or large pieces of material shall be initially broken up before reaching the bottom of the mill.

Another object has been to provide such means which will not add materially to the cost or weight of the machine.

Moreover, my means are arranged in interspaced relation with each other and thus form baies which serve to more uniformly distribute light, ilocculent materials over the entire length of the mill as it is fed therein.` l

'Ihe above objects and advantages have been accomplished by the device shown in the accompanying drawings, of which Fig. 1 is a fragmentary, side, sectional elevation of a hammer mill embodying my invention. Y

Fig. 2 is a fragmentary, front view of the device with the feed hopper removed.

My device comprises the usual base 5 forming a part of the chamber 6 of the mill, and. having the customary perforated bottom 7. A drive shaft 8 is provided, having discs 9 to which are pivotally attached the hammer arms 10. Each of these arms, as is customary, has a oating hammer 11.

Pivotally mounted above the casing isthe back breaker plate 12 of the mill which forms a hood over the grinding chamber. Carried by the back breaker plate is a front breaker plate 13 which forms a continuation of the grinding chamber of the mill. A feed chute 14 is provided whereby material is fed into the chamber. i

Secured to the inner face of the back breaker plate 12 are a plurality of runners 15. These runners are in the form of flat bars either attached to or cast integrally with the breaker plate, and they extend outwardly from the curved face 16 thereof for a considerable distance. terminate at the bottom of the breaker plate 12. `One of these runners is arranged on These runners A eachside of each pair ofhammer discs 9,

the chamber of the mill, andis ground inv the usual manner; v

The operation iof the mill as above described will be apparent to those skilled in theart from the foregoing description without a. detailed statementthereof.

- Obviously, some modifications of` the details herein shown and described may be made without departing from the spirit of my invention or the scope of the appended claims, and I do not, therefore, wish to be limited to the exact embodiment herein shown and described, the form shown being merely a preferred embodiment thereof.v

Having thus described my invention, what I claim is:

1. In a hammer mill having a plurality of sets of hammers, the combination with a back breaker plate of runners carried by the breaker plate, the working faces of the runners being arranged tangentially to the circular path of the hammers and being in interspaced relation with each other, the runners having their working faces arranged in a plane, a portion of which is intersected by the path of travel of the hammers.

2. In a hammer mill having a plurality of sets of hammers, the combination with a back breaker plate of straightfaced runners carried by the breaker plate, the Working ino faces of the runners being arranged tangentially to the circular path of the hammers and being in interspaced relation with each other, the runners having their Working faces arranged in a plane, a portion of which is intersected by the path of travelv of the hammers. f

3. In a hammer mill having a plurality of sets of hammers, the combination with a back breaker plate of runners carried bythe breaker plate and arranged so as to .have their Working faces tangent to the circular path of travel of the hammers and substantially above the horizontal center line of the mill.

4. In a `hammer mill having a plurality of -sets of hammers, the combination with a back breaker plate of runners carried by thev breaker plate, the Working faces of the runners being arranged tangentially to the circular path of the hammers and being in interspaced Vrelation With each other, the runners havingtheir Working faces arranged in a plane, the lower portion of vWhich lies in the path of travel of the hammers and the upper portion of which is out of the path of travel of the hammers.

5. In a hammer mill having a plurality of sets of hammers, the combination With a back breaker plate of straight-faced runners carried by the breaker gplate, the Working faces of the runnersv beingarranged tangentially to the circular path ofv travel of the hammers and being in interspaced arrangement With each other, the `runners having their Working faces substantially above the horizontal center line of the mill and in a plane, the lower portion of Which lies in the path of travel of the hammers'and the upper portion of which is out of the path of travel of the hammers. n

In testimony whereof, I have hereunto signed my name.

JOHN MURSCH. 

